Crown cap and pad



Jan. 8, 1952 A. 1.. GENOVESE CROWN CAP AND PAD Filed Oct. 6. 1947 INVENTOR.

ATTORNEYS.

Patented Jan. 8, 1952 t 2,581,647 GROWN CAP AND {PAD Anthony I eQ GenQVeSe, denton,l.Md,,assignor to The National Plastic Products Company, Oclenton, Md a corporation of Maryland Application october 6, 1947,;SeriaLNO. 178,093

2 Claims. 1

The present inventionrelates to abottle capto a bottle cap of the crown cap type whichis provided with a novel sealing padflof a ,plastic material and preferably a novel pad of polyethylene plastic.

The conventional crowncap heretoforeused includes a metal crown cap proper which is ,usually provided with a cork disk or pad on the interior thereof and where the cork cap is subject to the action of various beverages, the interior of the cork disk is also provided with a spot of tinfoil or the like in order to prevent contact between the cork and the contents. The cork pad is relatively soft and capable of deformation and when thecrown cap is assembled with the top of the bottle and crimped thereon, the corkis deformed and flattened to conform to the top of the bottle mouth.

.Since the cork pad is relatively. soft and takes a permanent deformation scaling is maintained solely by pressure of the metal cap. If. the metal cap. is improperly crimped about the bead at the mouth of the bottle an imperfectseal results.

It is one of the general object of the present invention, therefore, to'providea novel crown cap for bottles or the like, saidpap being provided with a novel plastic pad formed to be inherently resilient and capable of eiiiciently sealing the bottle top even when subjected to substantial pressure.

A second object of the present invention is to provide a novel sealing pad for a crown cap or the like, said pad being formed from polyethylene plastic.

Other objects and the nature and advantages of the instant invention will be apparent from the following description taken in conjunction with the accompanying drawings, wherein Figure l is a vertical section of a top of a bottle and a crown cap provided with a novel pad of the present invention prior to assembly of the cap and bottle.

Figure 2 is a view similar to Figure 1 of the assembled crown cap and bottle showing the pad under pressure.

Figure 3 is a perspective view of the sealing pad of the present invention.

Figure 4 is an enlarged sectional detail of a portion of the novel cap and pad in place on a bottle.

Referring to the figures of the drawing and particularly Figure 1 thereof, a bottle top is indicated in general at It and, as shown, is provided with a circumferential lip having a shoulcler II and a relatively flat lip I2. The crown cap: I 3,.shown ready for assembly with the. bottle circumferential, portion I5. YWithin the" interior of the cap I3 there is inserted a' sealing lpadlfi of a suitable plastic, preferably polyethylene, ,which is best shown in .FigureB. The 'aa' I6 is preferably formed" by. stamping and .Lcutting l the pad from a tape 'of polyethylene and duringfthe stamping and .cuttingoperation the pad is deformed to vprovide .a' downwardly extending Icircular rib I7 anda corresponding circula1-,]grooye The rib I T is so positlonedthatlwhn the .disk It is assembled with the cap I3 an'dLthe .cap. I,3Mpositioned uponthe, bottle tom, the rib, I"!

.willrestfupon the flattened mouth -I;2 of the bottle. Itwill also be notedthat the disk 1.611s

provided with athin upwardly extendingbead 9 and that the .pad I6 is originally slightly ,smaller .in diameter than the cap I3 so that it initially fitsrather loosely within the cap and i may beieasilyl assembled therewith.

when assembleduwith the bottle IB' as shown in 'Eig urefz, the skirt is crimped downwardly and the outwardly extending portion I 5 inwardly fi ainst theQbottle. At the samejtime a central circumferential portion of the cap i3 is depressed as indicated at 20. This serves to compress the pad I6 and flatten the rib II against the lip I2 of the bottle. The pad I6 is also forced outwardly since its diameter is increased by this flattening operation and a firm seal is produced between the deformed rib I! and the lip I2 of the bottle.

Further the relatively thick periphery of the pad I6 and bead I9 is forced downwardly so that the lower portion of the pad periphery is forced into the acute angular section between the skirt I4 and the side of the bead I I, as best shown in Figure 4 and indicated at 2|. The resilient rib I'I also overlaps the inner portion of the lip I2 and is forced into the mouth of the bottle so that a large area of contact or resilient seal is produced extending from the point indicated at 22 within the mouth of the bottle to the point 23 on the bead thereof.

The type of seal produced is entirely different than that produced when the cork pad on the conventional bottle is deformed since it does not depend entirely upon deformation to conform to the surface of the lip of the bottle but upon the resiliency of the polyethylene pad which exerts a constant pressure against the bottle lip. In the it is capable of minor plastic flow or deformation at its surface which contributes to an absolutely gas-tight and liquid-tight seal when used as a crown cap liner or pad, in accordance with the present invention.

Polyethylene is substantially impervious to most liquids and to gases so that when a pad of this character is provided, it is unnecessary to incorporate in the central lower portion thereof the conventional tin-foil spot.

it will be obvious to those skilled in the art that various changes may be made without departing from the spirit of the invention and therefore the invention is not limited to what is shown in the drawings and described in the specification but only as indicated in the appended claims.

I claim:

1. A metal closure cap for sealing the neck of a bottle, said bottle being provided with a generally fiat peripheral lip about the mouth thereof and a rounded bead circumscribing saidlip, said closure cap comprising a body portion and a depending 'skirt cooperating with said bead and, when assembled on the bottle defining with said bead an acute angular section, a polyethylene sealing pad within said body portion comprising a generally planar body portion, an annular rib extending downwardly from one face of said seal- 'ing pad substantially coextensive with the lip of said bottle when said cap and said bottle are assembled, and an annular groove in the other face of said sealing pad generally coextensive with said rib so as to render said rib relatively re silient and provide a resilient seal against said bottle lip and a peripheral upstanding rib ex-- tending from said last mentioned face of said pad to provide said pad with a thickened periphery 4 adapted to be displaced downwardly to substantially fill the acute angular section between said bead and the skirt of said cap upon assembly of said cap and said bottle.

2. A metal closure cap for sealing the neck of a bottle, said bottle being provided with a generally fiat peripheral lip about the mouth thereof and a rounded bead circumscribing said lip, said closure cap comprising a body portion and a depending skirt cooperating with said head and vwhen assembled on the bottle defining with said bead an acute angular section, a sealing pad within said body portion comprising a generally planar body portion, an annular rib extending Y tle whensaid cap and said bottle are assembled,

and an annular groove in the other face of said sealing pad generally coextensive with said rib so as to render said rib relatively resilient and provide a resilient seal against said'bottle-lip and a peripheral upstanding rib extending from said last mentioned face of said pad to provide said pad with a thickened periphery adapted to be displaced downwardly to substantially fill the acute angular section between said bead and the skirt of said cap upon assembly of said cap and said bottle.

ANTHONY LEO GENOVESE.

REFERENCES CITED The following references are of record in the file of this patent;

UNITED STATES PATENTS Number Name V Date 635,874 Sihler Oct. 31, 1899 774,425 Hicks Nov. 8, 1904 935,296 Butkus Sept. 28, 1909 1,276,343 Gaston Aug. 20, 1918 1,425,349 Taliaferro Aug. 8, 1922 1,805,623 Hammer May 19, 1931 2,238,681 Dorough Apr. 15, 1941 2,307,440 Wilson Jan. 5, 1943 2,327,455 Punte Aug. 24, 1943 2,396,491 Chamberlain Mar. 12, 1946 2,439,923 Clark Apr. 20, 1948 

